Coefficients of Friction

[Donut]

Our team hopes to do a traction test over this summer with varying materials. We'll post the results we get on here. Alot of what we test depends on the price of it and how difficult it is to attain, but these are some of the things I have in mind right now...

Standard Skyway Wheels (both 6" and 8" to settle the debate once and for all on whether bigger diameter wheels get better traction)
Pneumatic Skyway Wheels
Roughtop Tread
Wedgetop Tread
Linatrile Tread from Brecoflex
Correx Gum Tread from Brecoflex
Nitrile Tread from Brecoflex
Gum Rubber
Tread on Bottom of a Shoe
Anti-Slip Matting
Go-Kart or Mini-Bike Pneumatic Wheels
Colson Wheels

Some of these things we already have lying around, the others we'll have to figure out. Any other suggestions are welcome, and it can be ANYTHING (if you didn't gather that from the fact that we're going to test a shoe).